Known as the first Soviet sci-fi film, this film tells the tale of young Los, who lives in 1921 Moscow. When a mysterious radio message is beamed around the world, Los (Nikolai Tsereteli) receives it and begins building a spaceship to reach its sender: Aelita (Yuliya Solntseva), the daughter of the ruler of a totalitarian state on Mars. When Los helps the Martian proletariats begin an uprising, Aelita offers to help, but all is not as it seems.